MathSciNet bibliographic data MR877034 46J15 (46E30 47B35) Hruščëv, Sergeĭ V. Unconditional bases in \$L\sp 2(0,a)\$$L\sp 2(0,a)$. Proc. Amer. Math. Soc. 99 (1987), no. 4, 651–656. Article

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